ABB RELION REX640 Technical Manual page 1143

Protection and control

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1MRS759142 F

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings.

For troubleshooting, check the contents of this chapter and also the preprocessing

blocks in this document. The configuration can be written to the protection relay

once the mismatch is corrected.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of SRCPTOC can be described by using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 639: Functional module diagram

Resonance current calculation

This module calculates the resonance current per phase set as per setting

harmonic Num . The resonance current for phase A is calculated with the equation.

The resonance current is calculated through the filter implementation. The DC and

fundamental components are removed by passing the total RMS current through

the High pass filter. The K

High pass filter output through the K

Technical Manual

RMS value of current in phase A (contains up to 11

DC-component in phase A current

Fundamental component in phase A current

harmonic component in phase A current, K is defined by setting

harmonic Num

Calculated resonance current for phase A

harmonic component is removed by passing the

harmonic Band stop filter. The magnitude

Protection functions

Operation setting. The

(Equation 289)